Arlington Heights police arrested a DUI driver about 12:51 a.m. Friday on Golf Road, just east of New Wilke Road. The driver was transported in custody to Arlington Heights Police Department Headquarters. The driver’s green Ford Explorer was towed to a police holding area.

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Reasonable Suspicion to Investigate A Driver for DUI

Driving under the influence of alcohol to the extent that mental or motor skills are impaired is illegal in all jurisdictions in the United States. There are several traffic situations when a police officer comes into contact with a driver, and then follows procedures which lead to a DUI arrest:

The driver has been involved in an automobile accident and the officer has responded to the accident scene and is conducting an investigation.

The driver has been stopped at a sobriety checkpoint (also known as roadblocks).

The police have received a report, possibly via 9-1-1 from an anonymous citizen, that a driver appears to be DUI. The police officer usually verifies the erratic driving before makeing the traffic stop.

The patrol officer has observed erratic, suspicious driving, or a series of traffic infractions indicating the possibility that the driver may be impaired. This is by far the most common reason for stopping a suspect.

A police officer has stopped a vehicle for a lesser traffic offense and notices the signs of intoxication.

The following list of DUI symptoms, from a publication issued by the National Highway Traffic Safety Administration (DOT HS-805-711), is widely used in training officers to detect drunk drivers. After each symptom is a percentage figure which, according to NHTSA, indicates the statistical chances (%) through research, that a driver is over the legal limit.

Turning with wide radius, 65

Straddling center or lane marker, 65

Appearing to be drunk, 60

Almost striking object or vehicle, 60

Weaving, 60

Driving on other than designated roadway, 55

Swerving, 55

Slow speed (more than 10mph below limit), 50

Stopping (without cause) in traffic lane, 50

Drifting, 50

Following too closely, 45

Tires on center or land marker, 45

Braking erratically, 45

Driving into opposing or crossing traffic, 45

Signaling inconsistent with driving actions, 40

Stopping inappropriately (other than in lane), 35

Turning abruptly or illegally, 35

Accelerating or decelerating rapidly, 30

Headlights off, 30

If the officer observes enough to have a reasonable suspicion to legally justify a further detention and investigation, he will ask the driver to step out of the vehicle.
Reasonable suspicion requires less evidence than probable cause, but more than a mere hunch. A rule of thumb is that reasonable suspicion requires 25 % proof, and probable cause requires more than 50 % statistical chance. Therefore, if there is probable cause for arrest for DWI, as suggested by the research and examples used above, then there is reasonable suspicion to stop a driver.

Investigation
A police officer typically approaches the driver’s side window and asks some preliminary questions. During this phase of the traffic stop the officer will note if they detect any of the following indicators of intoxication

odor of an alcoholic beverage on the driver’s breath or in the car generally

slurred speech in response to the questioning

watery, blood shot, and/or reddish eyes

flushed face

droopy eyelids

difficulty in understanding and responding intelligently to question

fumbling with his or her driver’s license and registration

the plain-view presence of containers of alcoholic beverages in the vehicle.

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